Metallic hydrides with a clathrate-like structure are proposed to possess high critical temperature \(T_c\)  particularly for the rare-earth hydrides LaH\(_{10}\)  and YH\(_{10}\)  [1]}, [2]}, [3]}, [4]}. Subsequently, a series of superhydride LaH\(_{10 \pm x}\)  was synthesised in succession by compressing initial La and H\(_2\)  upon laser heating at pressures up to 200 GPa [5]}. Superconductivity in LaH\(_{10}\)  is further evidenced with \(T_c\)  above 250 K from the resistance and magnetic susceptibility measurements [6]}, [7]}, [8]}. A theoretical work suggests that Fmm phase of LaH\(_{10}\)  can be stabilized by the quantum atomic fluctuations with the superconductivity at above 140 GPa [9]}. Along this direction, various binary superhydrides have been extensively studied to facilitate \(T_c\)  by both the theoretical and experimental works [10]}, [11]}, [12]}, [13]}. Nevertheless, the necessity of extreme pressure conditions limits these high-T\(_c\) superconductors for further examinations of the superconducting properties by various techniques. Finding a route to have a superconducting phase with a comparable \(T_c\)  at easily accessible pressures is a great challenge and on demand.
